Malicious PDF — malware analysis report

Static analysis result for SHA-256 83be2f2742fcb3f2…

MALICIOUS

PDF

72.2 KB Created: 2021-09-18 16:15:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a12cc1b33c4121dec0d15b4735682ddb SHA-1: 3fbbeb1c78727a3114cde4fb04bb73b93ab5f8ea SHA-256: 83be2f2742fcb3f2f995781e79cbd1c16b108b09d8855dc1f666587ae1871a2e
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to unknown or potentially malicious domains, suggesting a phishing or malware distribution attempt. The presence of a QR code lure further supports a phishing attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://graciaindoutama.com/kingkong/userfiles/files/dapinunol.pdf
    • http://aromata.ru/upload/files/gekulapubigaxufizu.pdf
    • http://www.77ice.com/upload/files/87474224623.pdf
    • http://bestbelly.org/content/files/files/piwonilarisijuruguwinelor.pdf
    • http://bestapp4u.com/admin/uploadedfiles/file/13289041912.pdf
    • https://nevisnews.com/userfiles/14776414210.pdf
    • https://virker-ikke.dk/files/12068640202.pdf
    • http://tugrabilgisayar.net/resimler/files/vewovisemuvarajerajajo.pdf
    • https://agatanorek.com/files/file/23552295375.pdf
    • https://bisleriuber.genefied.co/ckfinder/userfiles/files/49497069715.pdf
    • http://ilkyoukais.com/Images/Media/files/lorowepinidipu.pdf
    • http://kiiga.ru/userfiles/file/neropuxapaxubune.pdf
    • http://thriftstorewebsites.net/flash/thriftstorewebsites.net/file/puxujomovesogudabijet.pdf
    • https://factorysales.com/userfiles/files/41711418197.pdf
    • http://idrogastermoclima.it/Utentifile/FCKPage/file/zemisirigabigozikeleg.pdf
    • http://kerekagy.hu/UserFiles/file/duvugiwugojijevuraxipi.pdf
    • http://labotinnghia.com/img/files/28263065007.pdf
    • http://sallytour.com/FileData/ckfinder/files/20210909_A2C09C01EC5F6C96.pdf
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145c80fb54b3---wofuwopemafujip.pdf
    • https://vicareyou.com/userfiles/file/jirijovorewa.pdf
    • http://hyunbulsa.org/~ewedd2/userfiles/file/pugom.pdf
    • https://viceda.com/userfiles/file/rerozixolu.pdf
    • http://billsky.ee/files/file/vekimapiniviwow.pdf
    • http://gioiacompany.net/images/upload/file/ronugunej.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=xls+to+pdf+app+download
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b77f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB77F 16792 bytes
font_01_sfnt_off0000cf96.bin
0bf06f85a8e3ee23131231a41d61d0afdfad018478bc2ccb400d7849b6c9940d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCF96 10260 bytes
font_02_sfnt_off0000e6e1.bin
27c2e02d47b7a6d59c39b062b127fc7eed0cff69ebfb1ad8ad96df1d520c6ddc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE6E1 16972 bytes

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